(FRANKFURT) -- A German sauna has banned a man caught secretly filming naked customers with a tiny camera hidden in his shower gel bottle, police said on Thursday.

``The suspect claimed he wanted to use the material for 'artistic purposes''' a spokesman for Bad Homburg police said.

The 37-year-old man had constructed an ingenious wireless device which transmitted video footage from the bottle to a video recorder in his nearby bag, police said.

He was caught after staff noticed he was always walking around clutching the shower gel bottle.

Police released the man but are still examining the device and may charge him with offending the public. He could also face prosecution under German telecommunications laws because he had no license to operate a wireless camera.

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